Review Lost slip

Hi I bought dress on Friday at secunda with debit card and I lost the slip when I took it back they say they can't do anything without the slip I suggested what if I go and pull out bank statement they say its not gonna work so I left the dress there at checkers I once lost the slip they took my card and checkbthat transaction and it was about a year I bought that thing on other shops you pull out the bank statement but at Exact it happened 4 days ago they can't help you